Which of the following lighting devices are from the high intensity discharge (HID) family?

Fluorescent lights utilize a different technology involving gas and phosphor coatings, not classified under HID. Halogen lights, while efficient, are a type of incandescent bulb and do not belong to the HID category. Although mercury vapor is an HID type, the inclusion of fluorescent and halogen makes this option incorrect.

Metal halide is indeed an HID type, but low-pressure sodium lights, while high-intensity, do not fit within the conventional HID classification. Furthermore, fluorescent lights, as mentioned earlier, utilize a different technology and are not part of the HID family, leading to the incorrect classification of this option.

While mercury vapor is an HID light, halogen and low-pressure sodium are not categorized as HID. Halogen lights are a type of incandescent, and low-pressure sodium lights, although high-intensity, fall outside the typical HID family, making this choice incorrect.